code: def test_is_punctuation(self):
      self.assertTrue(_is_punctuation("-"))
      self.assertTrue(_is_punctuation("$"))
      self.assertTrue(_is_punctuation("`"))
      self.assertTrue(_is_punctuation("."))
  
      self.assertFalse(_is_punctuation("A"))
      self.assertFalse(_is_punctuation(" "))
  
imports: import os
  import unittest
  from transformers import MobileBertTokenizer, MobileBertTokenizerFast
  from transformers.models.bert.tokenization_bert import VOCAB_FILES_NAMES, BasicTokenizer, WordpieceTokenizer, _is_control, _is_punctuation, _is_whitespace
  from transformers.testing_utils import require_tokenizers, slow
  from ...test_tokenization_common import TokenizerTesterMixin, filter_non_english
label_desc: Use image node_id 17 for calling the MobileBERTTokenizationTest obj's underlying member method code with example usage: obj.test_is_punctuation() without return types